neoplasm
• aged transgenic mice develop complex pheochromocytomas or neuroblastomas in the adrenal medulla
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endocrine/exocrine glands
• in mild cases the caudal pole of the adrenal gland is broached and the distribution of cells into distinct cortical and medullary regions is disrupted
• in severe cases, the adrenal medulla and much of the cortex are replaced by proliferating neurons
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• dysgenesis and fusion of cells in the adrenal medulla are seen
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• aged transgenic mice develop complex pheochromocytomas or neuroblastomas in the adrenal medulla
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nervous system
• hyperplasia of the autonomic ganglia and nerves in the pelvic connective tissue is seen
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• the size and number of the myenteric ganglia and their constituent parasympathetic neurons is increased in the colon
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• cells in the paraganglion adjacent to the adrenal gland are fused and dysgenic
• in severe cases where much of the adrenal gland is replaced by proliferating neurons the adjacent paraganglia are enlarged
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